Muffle for reduction-furnaces.



A. ROITZHEIM'. MUFFLE FOR REDUCTION FURNACES. APPLIOATION FILED 1813.22, 1913.

1,086,939. Pa tentgd Feb. 10, 1914-,

Jay. Z

I. Id a. I

ALEXANDER norrzHnn/i, or DUISIBURG-RUHRORT, GERMANY.

MUFFLE FOR REDUCTION-FURNACES.

Specification'of Letters Patent.

Patented Feb. 1'0;- EH4.

Application filed April 22, 1913. Serial No. 762,852.

'To'all whom it may concern Be t known that I, ALEXANDER Rorrz- HEIM, a subject of the K'ng of Prussia, Ger-.

man Emperorgiesiding at the city of Duislnu'g-Ituhrort, in the Kingdom of Prussia, German Empire, have invented certain new and useful Improvements in Multles for Heduction-Furnaces, of which the following is a specification.

My invention relates to anarrangenient for carrying-off the reduction gases from zinc furnaces with vertical mufi'les."

The treating of zinc ores in vertical muflles is rendered particularlydifficult by the resistance, which the reduction gases meetwhile passing through the high column of.

the charge, by which'resistance the passage of these gases, namely zinc vapors and car bo-nic oxid, may under circumstances also be rendered impossible. In consequence of this resistance (flier-ed by'the charge, the pressure of the 'gas in the muflle is increased in such a manner, that the zinc vapors will finally penetrate the always somewhat permeable wall of the mullle and mix with the heating gases, or will force the charge out through the fines provided for the escape of the reduction gases. These dangers"can be avoided by providing porous walls or perforated tubes, which extend throughout the 'cntire length of the mutlie and carryeolf the vapors from all levels. whereupon said vapors are conducted by suitable means into receivers, where they are condensed. The arrangements hitherto employed for this purpose will, however, work satisfactory only as long as the holes and-perforations through which the gases shall escape, have not been stopped up by the slagged ores. For metallurgical reasons'the charge of a zinc furnace is mixed in such a manner, that the slag will not melt, but on the other hand the ore and its bed-rock will very frequently soften at the temperatures employed in zinc furnaces, to such a degree that it assumes a viscid consistency like that of honey. This softened ore will, after a short while, fill up the holes and perforations in the said Walls and tubes, so that they will have to be frequently exchanged. The arrangement according to the present invention, has theobject of obviating these difliculties.

In the accompanying drawing such an arrangement is shown in section in Figure '1. Fig. 2 is a horizontal section through the mufile and the furnace, Fig. 3 is a section through a modification of the. mufile,

The muflle comprises an outer casing'a,

having an interior chamber or gas pa'ssageb which is separated from lateral ore-contain-' which will deposit on the slats from the charge in the muflie, said slats are mounted? as shown in Fig. 1, atdilferent inclines, so that they can be reached and cleaned from above by means of clearing irons. a I

In the modification shown in Fig. 3 th slats are arranged vertically beneath each other and at such a distance fronreach other that they leave apertures, which apertures can be readily reached and cleared, in case they should become choked with slag.

As soon as it is observed by the action of the furnace that the. apertures are commencing to be choked, the charge is removed from the mufiie, the door a closing the mutile at the top is opened and the apertures are cleared from above by means of a clearing iron. Of courseit is also possible to clear out the apertures in the manner described, without interrupting the reducing process in the muflle', it suitable devices are'employed which shall prevent the vapors escaping, after the door 6 has been opened.

I claim: 1. A mufile for reduction furnaces, comprising a vertical casing having a gas chamber therein formed of a plurality of horizontally disposed slats, the adjacent edges of which form apertures.

2. A. muflle for reduction furnaces, comprising a vertical casing having a gas chamber therein formed of a plurality of h0r.i

I 00 mg chambers f by means-0f walls formed of zontelly disposed sluts, the :idjncent'edges of which form. apertures situated in converging plnnes.

3. A muiiie for reduction furnaces, comprising a vertical casing having a plurality of ho i ontnlly disposed slats mounted therein and arranged to form a converging gas passage, and having their adjacent;

, edges spaced apart to -form apertures.

4 A mufiie for reduction furnaces, comrising a vertical casing having a plurality ofhorizont-elly disposed slats forming a central gas chamber and lateral ore containing chambers, the adjacent edges of said slats 15 lying in substantially the same horizontal 1,0ec,e39

plane and spaced apart, to form apertures for the passage of gas ire-1n the ore chamber i totlie gas chamber. 7

5. A muffle for reduction furnaces, comprising a vertical casing havingit gas chamber therein formed of a plurality of horizontally disposed slats forming apertures and inclined to the vertical axis of the chamber.

In testimony whereof I have aflixed my signature in presence of two witnesses.

\Vitnesscs HELEN Nnrnn, CHARLOTTE SOTMMER.

ALEXANDER ROITZIIEIM. [L.s.] 

